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CVE-2020-8813: graph_realtime.php in Cacti 1.2.8 allows remote attackers to execute arbitrary OS commands via shell metachara

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This week
HIGH 8.8WATCHLISTDOWNGRADEMITIGATEDOWNGRADE

CVE-2020-8813 is a high-severity flaw (CVSS 8.8) affecting cacti, fedora, open-audit. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

graph_realtime.php in Cacti 1.2.8 allows remote attackers to execute arbitrary OS commands via shell metacharacters in a cookie, if a guest user has the graph real-time privilege.

Why this priority

  • High severity
  • EPSS top 1%: very likely to be exploited
  • Public exploit reference
  • On your watchlist

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score8.8 (High)
Attack vectorNetwork (remote)
Attack complexityLow
Privileges neededLow
User interactionNone
EPSS exploit chance74.0% (top 1%)
CISA exploited listNo
WeaknessCWE-78
Published2020-02-22
Last modified2026-06-17
Publisher (CNA): MITRE · Vendor: cacti · debian · fedoraproject · opensuse · opmantek

Share: LinkedIn · X · Reddit

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

cacti cacti DOWNGRADE
Affected: 1.2.8
Fixed in: no fixed release known
Safe to downgrade to: a release before 1.2.8
1. Check installed version
apt-cache policy cacti || rpm -q cacti || cacti --version
2. No fixed release: DOWNGRADE to a release before 1.2.8 (Debian / Ubuntu)
apt-cache madison cacti sudo apt install cacti=<VERSION_BEFORE_1.2.8> sudo apt-mark hold cacti
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list cacti sudo dnf downgrade cacti-<VERSION_BEFORE_1.2.8> sudo dnf versionlock add cacti
Downgrade risk
Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.
After downgrade
Restart the service, and keep the package held until a fixed release ships.
fedoraproject fedora MITIGATE
Affected: 30 · 31 · 32
Fixed in: no fixed release known
Safe to downgrade to: a release before 30
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
opmantek open-audit DOWNGRADE
Affected: 3.3.1
Fixed in: no fixed release known
Safe to downgrade to: a release before 3.3.1
1. Check installed version
apt-cache policy open-audit || rpm -q open-audit || open-audit --version
2. No fixed release: DOWNGRADE to a release before 3.3.1 (Debian / Ubuntu)
apt-cache madison open-audit sudo apt install open-audit=<VERSION_BEFORE_3.3.1> sudo apt-mark hold open-audit
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list open-audit sudo dnf downgrade open-audit-<VERSION_BEFORE_3.3.1> sudo dnf versionlock add open-audit
Downgrade risk
Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.
After downgrade
Restart the service, and keep the package held until a fixed release ships.
opensuse suse package hub MITIGATE
Affected: all versions
Fixed in: no fixed release known
Safe to downgrade to: no unaffected older release
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
debian debian linux MITIGATE
Affected: 10.0
Fixed in: no fixed release known
Safe to downgrade to: a release before 10.0
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2020-8813?

cacti: downgrade or apply the listed mitigation; fedora: mitigate or apply the listed mitigation; open-audit: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2020-8813 being exploited?

CVE-2020-8813 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2020-8813 affect?

CVE-2020-8813 affects cacti, fedora, open-audit. Severity is high (CVSS 8.8). graph_realtime.php in Cacti 1.2.8 allows remote attackers to execute arbitrary OS commands via shell metacharacters in a cookie, if a guest user has the graph real-time privilege.

How urgent is CVE-2020-8813?

Priority 66/100. High severity; EPSS top 1%: very likely to be exploited; Public exploit reference; On your watchlist

Software pages

PHP vulnerabilities · Debian vulnerabilities

Related CVEs

References

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